2024 results by precinct
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Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,428 | 5,998 | 7,525 | |
| 2020 | R | 1,569 | 5,861 | 7,551 | |
| 2016 | R | 1,315 | 5,752 | 7,460 | |
| 2012 | R | 1,969 | 5,266 | 7,341 | |
| 2008 | R | 2,338 | 4,894 | 7,333 | |
| 2004 | R | 2,330 | 5,328 | 7,731 | |
| 2000 | R | 2,170 | 4,674 | 7,044 | |
| 1996 | R | 2,236 | 3,877 | 6,735 | |
| 1992 | R | 2,122 | 3,869 | 7,578 | |
| 1988 | R | 2,768 | 4,241 | 7,072 | |
| 1984 | R | 2,479 | 5,008 | 7,569 | |
| 1980 | R | 2,210 | 4,937 | 7,761 | |
| 1976 | R | 2,732 | 4,643 | 7,506 | |
| 1972 | R | 2,224 | 5,159 | 7,491 | |
| 1968 | R | 2,146 | 5,594 | 8,068 | |
| 1964 | R | 4,295 | 4,336 | 8,637 | |
| 1960 | R | 2,967 | 6,509 | 9,480 | |
| 1956 | R | 2,970 | 6,138 | 9,118 | |
| 1952 | R | 2,192 | 7,130 | 9,360 | |
| 1948 | R | 3,421 | 3,697 | 7,326 | |
| 1944 | R | 3,138 | 4,033 | 7,201 | |
| 1940 | R | 4,133 | 4,760 | 8,931 | |
| 1936 | D | 5,139 | 3,350 | 8,612 | |
| 1932 | D | 4,503 | 3,213 | 7,848 | |
| 1928 | R | 2,397 | 4,845 | 7,298 | |
| 1924 | R | 756 | 4,172 | 7,135 | |
| 1920 | R | 1,468 | 5,137 | 6,714 | |
| 1916 | R | 1,787 | 2,021 | 3,847 | |
| 1912 | D | 1,506 | 620 | 3,870 | |
| 1908 | R | 1,326 | 1,912 | 3,314 | |
| 1904 | R | 885 | 2,279 | 3,306 | |
| 1900 | R | 1,461 | 2,386 | 3,901 | |
| 1896 | R | 1,562 | 2,421 | 4,028 | |
| 1892 | R | 1,373 | 1,666 | 3,147 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
American
100.0%
African American
1.4%
Multiple ancestry combinations reported; no single grouping above 1%.
Sample size too small to break out by ancestry reliably.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 39.5 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$68,356
O'Brien County ranks near the middle of US counties.
O'Brien County$68,356
Iowa$75,059
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
13.3%
Children face moderate poverty.
Children under 1818.0%
Working age (18–64)100.0%
Seniors (65+)18.0%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
0.0%
speak English only
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 34.9% of residents not counted as adherents by any reporting body.
O'Brien County's R+60.7 margin in 2024 places it among the most one-sided presidential counties in Iowa, reflecting the broader rural realignment that has reshaped the state's electoral map over the past decade.
The Republican margin in O'Brien County reached its widest at sixty-one points in 2024. The margin in 2024 was sixty-one points, in line with the county's deep historical pattern.
O'Brien County's loyalty is rooted in its place. Median household income of $68,356, a 88% non-Hispanic-white share, and a population of 14,126 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Osceola County and Franklin County.
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